<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
        <c:if test="${data!=null}">
             data is null
        </c:if>
        <c:if test="${data1==null}">
             data1 is null
        </c:if>
        <c:if test="${data1==''}">
             data1 is null
        </c:if>
</body>
</html>